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mm/swap.c
28.4 KB
1da177e4c Linux-2.6.12-rc2 |
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/* * linux/mm/swap.c * * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds */ /* |
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* This file contains the default values for the operation of the |
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* Linux VM subsystem. Fine-tuning documentation can be found in * Documentation/sysctl/vm.txt. * Started 18.12.91 * Swap aging added 23.2.95, Stephen Tweedie. * Buffermem limits added 12.3.98, Rik van Riel. */ #include <linux/mm.h> #include <linux/sched.h> #include <linux/kernel_stat.h> #include <linux/swap.h> #include <linux/mman.h> #include <linux/pagemap.h> #include <linux/pagevec.h> #include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/mm_inline.h> |
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#include <linux/percpu_counter.h> #include <linux/percpu.h> #include <linux/cpu.h> #include <linux/notifier.h> |
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#include <linux/backing-dev.h> |
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#include <linux/memcontrol.h> |
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#include <linux/gfp.h> |
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#include <linux/uio.h> |
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#include <linux/hugetlb.h> |
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|
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#include "internal.h" |
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#define CREATE_TRACE_POINTS #include <trace/events/pagemap.h> |
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/* How many pages do we try to swap or page in/out together? */ int page_cluster; |
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static DEFINE_PER_CPU(struct pagevec, lru_add_pvec); |
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static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs); |
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static DEFINE_PER_CPU(struct pagevec, lru_deactivate_pvecs); |
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|
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/* * This path almost never happens for VM activity - pages are normally * freed via pagevecs. But it gets used by networking. */ |
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static void __page_cache_release(struct page *page) |
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{ if (PageLRU(page)) { |
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struct zone *zone = page_zone(page); |
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struct lruvec *lruvec; unsigned long flags; |
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spin_lock_irqsave(&zone->lru_lock, flags); |
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lruvec = mem_cgroup_page_lruvec(page, zone); |
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VM_BUG_ON(!PageLRU(page)); __ClearPageLRU(page); |
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del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
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spin_unlock_irqrestore(&zone->lru_lock, flags); } |
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} static void __put_single_page(struct page *page) { __page_cache_release(page); |
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free_hot_cold_page(page, false); |
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} |
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static void __put_compound_page(struct page *page) |
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{ |
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compound_page_dtor *dtor; |
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|
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__page_cache_release(page); dtor = get_compound_page_dtor(page); (*dtor)(page); } static void put_compound_page(struct page *page) { if (unlikely(PageTail(page))) { /* __split_huge_page_refcount can run under us */ |
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struct page *page_head = compound_head(page); |
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if (likely(page != page_head && get_page_unless_zero(page_head))) { |
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unsigned long flags; |
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/* * THP can not break up slab pages so avoid taking * compound_lock(). Slab performs non-atomic bit ops * on page->flags for better performance. In particular * slab_unlock() in slub used to be a hot path. It is * still hot on arches that do not support * this_cpu_cmpxchg_double(). */ |
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if (PageSlab(page_head) || PageHeadHuge(page_head)) { if (likely(PageTail(page))) { /* * __split_huge_page_refcount * cannot race here. */ VM_BUG_ON(!PageHead(page_head)); atomic_dec(&page->_mapcount); |
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if (put_page_testzero(page_head)) VM_BUG_ON(1); |
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if (put_page_testzero(page_head)) __put_compound_page(page_head); return; |
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} else |
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/* * __split_huge_page_refcount * run before us, "page" was a * THP tail. The split * page_head has been freed * and reallocated as slab or * hugetlbfs page of smaller * order (only possible if * reallocated as slab on * x86). */ |
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goto skip_lock; } |
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/* |
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* page_head wasn't a dangling pointer but it * may not be a head page anymore by the time * we obtain the lock. That is ok as long as it * can't be freed from under us. |
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*/ |
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flags = compound_lock_irqsave(page_head); if (unlikely(!PageTail(page))) { /* __split_huge_page_refcount run before us */ compound_unlock_irqrestore(page_head, flags); |
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skip_lock: |
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if (put_page_testzero(page_head)) { /* * The head page may have been * freed and reallocated as a * compound page of smaller * order and then freed again. * All we know is that it * cannot have become: a THP * page, a compound page of * higher order, a tail page. * That is because we still * hold the refcount of the * split THP tail and * page_head was the THP head * before the split. */ if (PageHead(page_head)) __put_compound_page(page_head); else __put_single_page(page_head); } |
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out_put_single: |
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if (put_page_testzero(page)) __put_single_page(page); return; } VM_BUG_ON(page_head != page->first_page); /* * We can release the refcount taken by |
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* get_page_unless_zero() now that * __split_huge_page_refcount() is blocked on * the compound_lock. |
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*/ if (put_page_testzero(page_head)) VM_BUG_ON(1); /* __split_huge_page_refcount will wait now */ |
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VM_BUG_ON(page_mapcount(page) <= 0); atomic_dec(&page->_mapcount); |
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VM_BUG_ON(atomic_read(&page_head->_count) <= 0); |
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VM_BUG_ON(atomic_read(&page->_count) != 0); |
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compound_unlock_irqrestore(page_head, flags); |
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|
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if (put_page_testzero(page_head)) { if (PageHead(page_head)) __put_compound_page(page_head); else __put_single_page(page_head); } |
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} else { /* page_head is a dangling pointer */ VM_BUG_ON(PageTail(page)); goto out_put_single; } } else if (put_page_testzero(page)) { if (PageHead(page)) __put_compound_page(page); else __put_single_page(page); |
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} |
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} void put_page(struct page *page) { if (unlikely(PageCompound(page))) put_compound_page(page); else if (put_page_testzero(page)) |
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__put_single_page(page); |
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} EXPORT_SYMBOL(put_page); |
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|
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/* * This function is exported but must not be called by anything other * than get_page(). It implements the slow path of get_page(). */ bool __get_page_tail(struct page *page) { /* * This takes care of get_page() if run on a tail page * returned by one of the get_user_pages/follow_page variants. * get_user_pages/follow_page itself doesn't need the compound * lock because it runs __get_page_tail_foll() under the * proper PT lock that already serializes against * split_huge_page(). */ |
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unsigned long flags; |
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bool got = false; |
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struct page *page_head = compound_head(page); |
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if (likely(page != page_head && get_page_unless_zero(page_head))) { /* Ref to put_compound_page() comment. */ if (PageSlab(page_head) || PageHeadHuge(page_head)) { |
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if (likely(PageTail(page))) { |
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/* * This is a hugetlbfs page or a slab * page. __split_huge_page_refcount * cannot race here. */ VM_BUG_ON(!PageHead(page_head)); |
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__get_page_tail_foll(page, false); |
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return true; } else { /* * __split_huge_page_refcount run * before us, "page" was a THP * tail. The split page_head has been * freed and reallocated as slab or * hugetlbfs page of smaller order * (only possible if reallocated as * slab on x86). */ |
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put_page(page_head); |
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return false; } } /* * page_head wasn't a dangling pointer but it * may not be a head page anymore by the time * we obtain the lock. That is ok as long as it * can't be freed from under us. */ flags = compound_lock_irqsave(page_head); /* here __split_huge_page_refcount won't run anymore */ if (likely(PageTail(page))) { __get_page_tail_foll(page, false); got = true; |
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} |
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compound_unlock_irqrestore(page_head, flags); if (unlikely(!got)) put_page(page_head); |
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} return got; } EXPORT_SYMBOL(__get_page_tail); |
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/** |
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* put_pages_list() - release a list of pages * @pages: list of pages threaded on page->lru |
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* * Release a list of pages which are strung together on page.lru. Currently * used by read_cache_pages() and related error recovery code. |
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*/ void put_pages_list(struct list_head *pages) { while (!list_empty(pages)) { struct page *victim; victim = list_entry(pages->prev, struct page, lru); list_del(&victim->lru); page_cache_release(victim); } } EXPORT_SYMBOL(put_pages_list); |
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/* * get_kernel_pages() - pin kernel pages in memory * @kiov: An array of struct kvec structures * @nr_segs: number of segments to pin * @write: pinning for read/write, currently ignored * @pages: array that receives pointers to the pages pinned. * Should be at least nr_segs long. * * Returns number of pages pinned. This may be fewer than the number * requested. If nr_pages is 0 or negative, returns 0. If no pages * were pinned, returns -errno. Each page returned must be released * with a put_page() call when it is finished with. */ int get_kernel_pages(const struct kvec *kiov, int nr_segs, int write, struct page **pages) { int seg; for (seg = 0; seg < nr_segs; seg++) { if (WARN_ON(kiov[seg].iov_len != PAGE_SIZE)) return seg; |
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pages[seg] = kmap_to_page(kiov[seg].iov_base); |
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page_cache_get(pages[seg]); } return seg; } EXPORT_SYMBOL_GPL(get_kernel_pages); /* * get_kernel_page() - pin a kernel page in memory * @start: starting kernel address * @write: pinning for read/write, currently ignored * @pages: array that receives pointer to the page pinned. * Must be at least nr_segs long. * * Returns 1 if page is pinned. If the page was not pinned, returns * -errno. The page returned must be released with a put_page() call * when it is finished with. */ int get_kernel_page(unsigned long start, int write, struct page **pages) { const struct kvec kiov = { .iov_base = (void *)start, .iov_len = PAGE_SIZE }; return get_kernel_pages(&kiov, 1, write, pages); } EXPORT_SYMBOL_GPL(get_kernel_page); |
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static void pagevec_lru_move_fn(struct pagevec *pvec, |
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void (*move_fn)(struct page *page, struct lruvec *lruvec, void *arg), void *arg) |
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{ int i; |
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struct zone *zone = NULL; |
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struct lruvec *lruvec; |
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unsigned long flags = 0; |
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for (i = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; struct zone *pagezone = page_zone(page); if (pagezone != zone) { if (zone) |
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spin_unlock_irqrestore(&zone->lru_lock, flags); |
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zone = pagezone; |
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spin_lock_irqsave(&zone->lru_lock, flags); |
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} |
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|
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lruvec = mem_cgroup_page_lruvec(page, zone); (*move_fn)(page, lruvec, arg); |
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} if (zone) |
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spin_unlock_irqrestore(&zone->lru_lock, flags); |
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release_pages(pvec->pages, pvec->nr, pvec->cold); pagevec_reinit(pvec); |
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} |
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static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec, void *arg) |
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{ int *pgmoved = arg; |
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if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { enum lru_list lru = page_lru_base_type(page); |
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list_move_tail(&page->lru, &lruvec->lists[lru]); |
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(*pgmoved)++; } } /* * pagevec_move_tail() must be called with IRQ disabled. * Otherwise this may cause nasty races. */ static void pagevec_move_tail(struct pagevec *pvec) { int pgmoved = 0; pagevec_lru_move_fn(pvec, pagevec_move_tail_fn, &pgmoved); __count_vm_events(PGROTATED, pgmoved); } |
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/* |
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* Writeback is about to end against a page which has been marked for immediate * reclaim. If it still appears to be reclaimable, move it to the tail of the |
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* inactive list. |
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*/ |
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void rotate_reclaimable_page(struct page *page) |
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{ |
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if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) && |
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!PageUnevictable(page) && PageLRU(page)) { |
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struct pagevec *pvec; unsigned long flags; page_cache_get(page); local_irq_save(flags); pvec = &__get_cpu_var(lru_rotate_pvecs); if (!pagevec_add(pvec, page)) pagevec_move_tail(pvec); local_irq_restore(flags); } |
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} |
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static void update_page_reclaim_stat(struct lruvec *lruvec, |
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int file, int rotated) { |
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struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat; |
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reclaim_stat->recent_scanned[file]++; if (rotated) reclaim_stat->recent_rotated[file]++; |
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} |
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static void __activate_page(struct page *page, struct lruvec *lruvec, void *arg) |
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{ |
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if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { |
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int file = page_is_file_cache(page); int lru = page_lru_base_type(page); |
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|
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del_page_from_lru_list(page, lruvec, lru); |
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SetPageActive(page); lru += LRU_ACTIVE; |
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add_page_to_lru_list(page, lruvec, lru); |
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trace_mm_lru_activate(page, page_to_pfn(page)); |
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|
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__count_vm_event(PGACTIVATE); update_page_reclaim_stat(lruvec, file, 1); |
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} |
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} #ifdef CONFIG_SMP static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs); static void activate_page_drain(int cpu) { struct pagevec *pvec = &per_cpu(activate_page_pvecs, cpu); if (pagevec_count(pvec)) pagevec_lru_move_fn(pvec, __activate_page, NULL); } |
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static bool need_activate_page_drain(int cpu) { return pagevec_count(&per_cpu(activate_page_pvecs, cpu)) != 0; } |
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void activate_page(struct page *page) { if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { struct pagevec *pvec = &get_cpu_var(activate_page_pvecs); page_cache_get(page); if (!pagevec_add(pvec, page)) pagevec_lru_move_fn(pvec, __activate_page, NULL); put_cpu_var(activate_page_pvecs); } } #else static inline void activate_page_drain(int cpu) { } |
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static bool need_activate_page_drain(int cpu) { return false; } |
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void activate_page(struct page *page) { struct zone *zone = page_zone(page); spin_lock_irq(&zone->lru_lock); |
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__activate_page(page, mem_cgroup_page_lruvec(page, zone), NULL); |
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spin_unlock_irq(&zone->lru_lock); } |
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#endif |
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|
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static void __lru_cache_activate_page(struct page *page) { struct pagevec *pvec = &get_cpu_var(lru_add_pvec); int i; /* * Search backwards on the optimistic assumption that the page being * activated has just been added to this pagevec. Note that only * the local pagevec is examined as a !PageLRU page could be in the * process of being released, reclaimed, migrated or on a remote * pagevec that is currently being drained. Furthermore, marking * a remote pagevec's page PageActive potentially hits a race where * a page is marked PageActive just after it is added to the inactive * list causing accounting errors and BUG_ON checks to trigger. */ for (i = pagevec_count(pvec) - 1; i >= 0; i--) { struct page *pagevec_page = pvec->pages[i]; if (pagevec_page == page) { SetPageActive(page); break; } } put_cpu_var(lru_add_pvec); } |
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505 506 507 508 509 510 511 |
/* * Mark a page as having seen activity. * * inactive,unreferenced -> inactive,referenced * inactive,referenced -> active,unreferenced * active,unreferenced -> active,referenced */ |
920c7a5d0 mm: remove fastca... |
512 |
void mark_page_accessed(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
513 |
{ |
894bc3104 Unevictable LRU I... |
514 |
if (!PageActive(page) && !PageUnevictable(page) && |
059285a25 mm: activate !Pag... |
515 516 517 518 519 520 521 522 523 524 525 526 |
PageReferenced(page)) { /* * If the page is on the LRU, queue it for activation via * activate_page_pvecs. Otherwise, assume the page is on a * pagevec, mark it active and it'll be moved to the active * LRU on the next drain. */ if (PageLRU(page)) activate_page(page); else __lru_cache_activate_page(page); |
1da177e4c Linux-2.6.12-rc2 |
527 528 529 530 531 |
ClearPageReferenced(page); } else if (!PageReferenced(page)) { SetPageReferenced(page); } } |
1da177e4c Linux-2.6.12-rc2 |
532 |
EXPORT_SYMBOL(mark_page_accessed); |
d618a27c7 mm: non-atomicall... |
533 534 535 536 537 538 539 540 541 542 |
/* * Used to mark_page_accessed(page) that is not visible yet and when it is * still safe to use non-atomic ops */ void init_page_accessed(struct page *page) { if (!PageReferenced(page)) __SetPageReferenced(page); } EXPORT_SYMBOL(init_page_accessed); |
69aa12f29 mm/swap.c: clean ... |
543 |
static void __lru_cache_add(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
544 |
{ |
13f7f7898 mm: pagevec: defe... |
545 |
struct pagevec *pvec = &get_cpu_var(lru_add_pvec); |
1da177e4c Linux-2.6.12-rc2 |
546 |
page_cache_get(page); |
d741c9cde mm: fix nonunifor... |
547 |
if (!pagevec_space(pvec)) |
a0b8cab3b mm: remove lru pa... |
548 |
__pagevec_lru_add(pvec); |
d741c9cde mm: fix nonunifor... |
549 |
pagevec_add(pvec, page); |
13f7f7898 mm: pagevec: defe... |
550 |
put_cpu_var(lru_add_pvec); |
1da177e4c Linux-2.6.12-rc2 |
551 |
} |
69aa12f29 mm/swap.c: clean ... |
552 553 554 555 556 557 558 |
/** * lru_cache_add: add a page to the page lists * @page: the page to add */ void lru_cache_add_anon(struct page *page) { |
6ffef5d8b mm: do not use un... |
559 560 |
if (PageActive(page)) ClearPageActive(page); |
69aa12f29 mm/swap.c: clean ... |
561 562 563 564 565 |
__lru_cache_add(page); } void lru_cache_add_file(struct page *page) { |
6ffef5d8b mm: do not use un... |
566 567 |
if (PageActive(page)) ClearPageActive(page); |
69aa12f29 mm/swap.c: clean ... |
568 569 570 |
__lru_cache_add(page); } EXPORT_SYMBOL(lru_cache_add_file); |
1da177e4c Linux-2.6.12-rc2 |
571 |
|
f04e9ebbe swap: use an arra... |
572 |
/** |
c53954a09 mm: remove lru pa... |
573 |
* lru_cache_add - add a page to a page list |
f04e9ebbe swap: use an arra... |
574 |
* @page: the page to be added to the LRU. |
69aa12f29 mm/swap.c: clean ... |
575 576 577 578 579 |
* * Queue the page for addition to the LRU via pagevec. The decision on whether * to add the page to the [in]active [file|anon] list is deferred until the * pagevec is drained. This gives a chance for the caller of lru_cache_add() * have the page added to the active list using mark_page_accessed(). |
f04e9ebbe swap: use an arra... |
580 |
*/ |
c53954a09 mm: remove lru pa... |
581 |
void lru_cache_add(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
582 |
{ |
ef2a2cbdd mm/swap.c: clear ... |
583 |
VM_BUG_ON(PageActive(page) && PageUnevictable(page)); |
13f7f7898 mm: pagevec: defe... |
584 |
VM_BUG_ON(PageLRU(page)); |
c53954a09 mm: remove lru pa... |
585 |
__lru_cache_add(page); |
1da177e4c Linux-2.6.12-rc2 |
586 |
} |
894bc3104 Unevictable LRU I... |
587 588 589 590 591 592 593 594 595 596 597 598 599 |
/** * add_page_to_unevictable_list - add a page to the unevictable list * @page: the page to be added to the unevictable list * * Add page directly to its zone's unevictable list. To avoid races with * tasks that might be making the page evictable, through eg. munlock, * munmap or exit, while it's not on the lru, we want to add the page * while it's locked or otherwise "invisible" to other tasks. This is * difficult to do when using the pagevec cache, so bypass that. */ void add_page_to_unevictable_list(struct page *page) { struct zone *zone = page_zone(page); |
fa9add641 mm/memcg: apply a... |
600 |
struct lruvec *lruvec; |
894bc3104 Unevictable LRU I... |
601 602 |
spin_lock_irq(&zone->lru_lock); |
fa9add641 mm/memcg: apply a... |
603 |
lruvec = mem_cgroup_page_lruvec(page, zone); |
ef2a2cbdd mm/swap.c: clear ... |
604 |
ClearPageActive(page); |
894bc3104 Unevictable LRU I... |
605 606 |
SetPageUnevictable(page); SetPageLRU(page); |
fa9add641 mm/memcg: apply a... |
607 |
add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE); |
894bc3104 Unevictable LRU I... |
608 609 |
spin_unlock_irq(&zone->lru_lock); } |
902aaed0d mm: use pagevec t... |
610 |
/* |
315601809 mm: deactivate in... |
611 612 613 614 615 |
* If the page can not be invalidated, it is moved to the * inactive list to speed up its reclaim. It is moved to the * head of the list, rather than the tail, to give the flusher * threads some time to write it out, as this is much more * effective than the single-page writeout from reclaim. |
278df9f45 mm: reclaim inval... |
616 617 618 619 620 621 622 623 624 625 626 627 628 629 |
* * If the page isn't page_mapped and dirty/writeback, the page * could reclaim asap using PG_reclaim. * * 1. active, mapped page -> none * 2. active, dirty/writeback page -> inactive, head, PG_reclaim * 3. inactive, mapped page -> none * 4. inactive, dirty/writeback page -> inactive, head, PG_reclaim * 5. inactive, clean -> inactive, tail * 6. Others -> none * * In 4, why it moves inactive's head, the VM expects the page would * be write it out by flusher threads as this is much more effective * than the single-page writeout from reclaim. |
315601809 mm: deactivate in... |
630 |
*/ |
fa9add641 mm/memcg: apply a... |
631 632 |
static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec, void *arg) |
315601809 mm: deactivate in... |
633 634 |
{ int lru, file; |
278df9f45 mm: reclaim inval... |
635 |
bool active; |
315601809 mm: deactivate in... |
636 |
|
278df9f45 mm: reclaim inval... |
637 |
if (!PageLRU(page)) |
315601809 mm: deactivate in... |
638 |
return; |
bad49d9c8 mm: check PageUne... |
639 640 |
if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
641 642 643 |
/* Some processes are using the page */ if (page_mapped(page)) return; |
278df9f45 mm: reclaim inval... |
644 |
active = PageActive(page); |
315601809 mm: deactivate in... |
645 646 |
file = page_is_file_cache(page); lru = page_lru_base_type(page); |
fa9add641 mm/memcg: apply a... |
647 648 |
del_page_from_lru_list(page, lruvec, lru + active); |
315601809 mm: deactivate in... |
649 650 |
ClearPageActive(page); ClearPageReferenced(page); |
fa9add641 mm/memcg: apply a... |
651 |
add_page_to_lru_list(page, lruvec, lru); |
315601809 mm: deactivate in... |
652 |
|
278df9f45 mm: reclaim inval... |
653 654 655 656 657 658 659 660 661 662 663 664 |
if (PageWriteback(page) || PageDirty(page)) { /* * PG_reclaim could be raced with end_page_writeback * It can make readahead confusing. But race window * is _really_ small and it's non-critical problem. */ SetPageReclaim(page); } else { /* * The page's writeback ends up during pagevec * We moves tha page into tail of inactive. */ |
925b7673c mm: make per-memc... |
665 |
list_move_tail(&page->lru, &lruvec->lists[lru]); |
278df9f45 mm: reclaim inval... |
666 667 668 669 670 |
__count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); |
fa9add641 mm/memcg: apply a... |
671 |
update_page_reclaim_stat(lruvec, file, 0); |
315601809 mm: deactivate in... |
672 |
} |
315601809 mm: deactivate in... |
673 |
/* |
902aaed0d mm: use pagevec t... |
674 675 676 677 |
* Drain pages out of the cpu's pagevecs. * Either "cpu" is the current CPU, and preemption has already been * disabled; or "cpu" is being hot-unplugged, and is already dead. */ |
f0cb3c76a mm: drain percpu ... |
678 |
void lru_add_drain_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
679 |
{ |
13f7f7898 mm: pagevec: defe... |
680 |
struct pagevec *pvec = &per_cpu(lru_add_pvec, cpu); |
1da177e4c Linux-2.6.12-rc2 |
681 |
|
13f7f7898 mm: pagevec: defe... |
682 |
if (pagevec_count(pvec)) |
a0b8cab3b mm: remove lru pa... |
683 |
__pagevec_lru_add(pvec); |
902aaed0d mm: use pagevec t... |
684 685 686 687 688 689 690 691 692 693 |
pvec = &per_cpu(lru_rotate_pvecs, cpu); if (pagevec_count(pvec)) { unsigned long flags; /* No harm done if a racing interrupt already did this */ local_irq_save(flags); pagevec_move_tail(pvec); local_irq_restore(flags); } |
315601809 mm: deactivate in... |
694 695 696 |
pvec = &per_cpu(lru_deactivate_pvecs, cpu); if (pagevec_count(pvec)) |
3dd7ae8ec mm: simplify code... |
697 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
eb709b0d0 mm: batch activat... |
698 699 |
activate_page_drain(cpu); |
315601809 mm: deactivate in... |
700 701 702 703 704 705 706 707 708 709 710 711 |
} /** * deactivate_page - forcefully deactivate a page * @page: page to deactivate * * This function hints the VM that @page is a good reclaim candidate, * for example if its invalidation fails due to the page being dirty * or under writeback. */ void deactivate_page(struct page *page) { |
821ed6bbe mm: filter unevic... |
712 713 714 715 716 717 |
/* * In a workload with many unevictable page such as mprotect, unevictable * page deactivation for accelerating reclaim is pointless. */ if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
718 719 720 721 |
if (likely(get_page_unless_zero(page))) { struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs); if (!pagevec_add(pvec, page)) |
3dd7ae8ec mm: simplify code... |
722 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
315601809 mm: deactivate in... |
723 724 |
put_cpu_var(lru_deactivate_pvecs); } |
80bfed904 [PATCH] consolida... |
725 726 727 728 |
} void lru_add_drain(void) { |
f0cb3c76a mm: drain percpu ... |
729 |
lru_add_drain_cpu(get_cpu()); |
80bfed904 [PATCH] consolida... |
730 |
put_cpu(); |
1da177e4c Linux-2.6.12-rc2 |
731 |
} |
c4028958b WorkStruct: make ... |
732 |
static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fce [PATCH] mm: migra... |
733 734 735 |
{ lru_add_drain(); } |
5fbc46163 mm: make lru_add_... |
736 737 738 |
static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); void lru_add_drain_all(void) |
053837fce [PATCH] mm: migra... |
739 |
{ |
5fbc46163 mm: make lru_add_... |
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
static DEFINE_MUTEX(lock); static struct cpumask has_work; int cpu; mutex_lock(&lock); get_online_cpus(); cpumask_clear(&has_work); for_each_online_cpu(cpu) { struct work_struct *work = &per_cpu(lru_add_drain_work, cpu); if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) || pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) || pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) || need_activate_page_drain(cpu)) { INIT_WORK(work, lru_add_drain_per_cpu); schedule_work_on(cpu, work); cpumask_set_cpu(cpu, &has_work); } } for_each_cpu(cpu, &has_work) flush_work(&per_cpu(lru_add_drain_work, cpu)); put_online_cpus(); mutex_unlock(&lock); |
053837fce [PATCH] mm: migra... |
766 |
} |
1da177e4c Linux-2.6.12-rc2 |
767 |
/* |
1da177e4c Linux-2.6.12-rc2 |
768 769 770 771 772 773 774 |
* Batched page_cache_release(). Decrement the reference count on all the * passed pages. If it fell to zero then remove the page from the LRU and * free it. * * Avoid taking zone->lru_lock if possible, but if it is taken, retain it * for the remainder of the operation. * |
ab33dc09a swap: update func... |
775 776 777 778 |
* The locking in this function is against shrink_inactive_list(): we recheck * the page count inside the lock to see whether shrink_inactive_list() * grabbed the page via the LRU. If it did, give up: shrink_inactive_list() * will free it. |
1da177e4c Linux-2.6.12-rc2 |
779 |
*/ |
3e7379c0f mm: page_alloc: c... |
780 |
void release_pages(struct page **pages, int nr, bool cold) |
1da177e4c Linux-2.6.12-rc2 |
781 782 |
{ int i; |
cc59850ef mm: add free_hot_... |
783 |
LIST_HEAD(pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
784 |
struct zone *zone = NULL; |
fa9add641 mm/memcg: apply a... |
785 |
struct lruvec *lruvec; |
902aaed0d mm: use pagevec t... |
786 |
unsigned long uninitialized_var(flags); |
1da177e4c Linux-2.6.12-rc2 |
787 |
|
1da177e4c Linux-2.6.12-rc2 |
788 789 |
for (i = 0; i < nr; i++) { struct page *page = pages[i]; |
1da177e4c Linux-2.6.12-rc2 |
790 |
|
8519fb30e [PATCH] mm: compo... |
791 792 |
if (unlikely(PageCompound(page))) { if (zone) { |
902aaed0d mm: use pagevec t... |
793 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
8519fb30e [PATCH] mm: compo... |
794 795 796 797 798 |
zone = NULL; } put_compound_page(page); continue; } |
b5810039a [PATCH] core remo... |
799 |
if (!put_page_testzero(page)) |
1da177e4c Linux-2.6.12-rc2 |
800 |
continue; |
46453a6e1 [PATCH] mm: never... |
801 802 |
if (PageLRU(page)) { struct zone *pagezone = page_zone(page); |
894bc3104 Unevictable LRU I... |
803 |
|
46453a6e1 [PATCH] mm: never... |
804 805 |
if (pagezone != zone) { if (zone) |
902aaed0d mm: use pagevec t... |
806 807 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
808 |
zone = pagezone; |
902aaed0d mm: use pagevec t... |
809 |
spin_lock_irqsave(&zone->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
810 |
} |
fa9add641 mm/memcg: apply a... |
811 812 |
lruvec = mem_cgroup_page_lruvec(page, zone); |
725d704ec [PATCH] mm: VM_BU... |
813 |
VM_BUG_ON(!PageLRU(page)); |
674539115 [PATCH] mm: less ... |
814 |
__ClearPageLRU(page); |
fa9add641 mm/memcg: apply a... |
815 |
del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
46453a6e1 [PATCH] mm: never... |
816 |
} |
c53954a09 mm: remove lru pa... |
817 |
/* Clear Active bit in case of parallel mark_page_accessed */ |
fa6d2dd22 mm: do not use at... |
818 |
__ClearPageActive(page); |
c53954a09 mm: remove lru pa... |
819 |
|
cc59850ef mm: add free_hot_... |
820 |
list_add(&page->lru, &pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
821 822 |
} if (zone) |
902aaed0d mm: use pagevec t... |
823 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
824 |
|
cc59850ef mm: add free_hot_... |
825 |
free_hot_cold_page_list(&pages_to_free, cold); |
1da177e4c Linux-2.6.12-rc2 |
826 |
} |
0be8557bc fuse: use release... |
827 |
EXPORT_SYMBOL(release_pages); |
1da177e4c Linux-2.6.12-rc2 |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 |
/* * The pages which we're about to release may be in the deferred lru-addition * queues. That would prevent them from really being freed right now. That's * OK from a correctness point of view but is inefficient - those pages may be * cache-warm and we want to give them back to the page allocator ASAP. * * So __pagevec_release() will drain those queues here. __pagevec_lru_add() * and __pagevec_lru_add_active() call release_pages() directly to avoid * mutual recursion. */ void __pagevec_release(struct pagevec *pvec) { lru_add_drain(); release_pages(pvec->pages, pagevec_count(pvec), pvec->cold); pagevec_reinit(pvec); } |
7f2857018 Export __pagevec_... |
845 |
EXPORT_SYMBOL(__pagevec_release); |
12d271078 memcg: fix split_... |
846 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
71e3aac07 thp: transparent ... |
847 |
/* used by __split_huge_page_refcount() */ |
fa9add641 mm/memcg: apply a... |
848 |
void lru_add_page_tail(struct page *page, struct page *page_tail, |
5bc7b8aca mm: thp: add spli... |
849 |
struct lruvec *lruvec, struct list_head *list) |
71e3aac07 thp: transparent ... |
850 |
{ |
71e3aac07 thp: transparent ... |
851 |
const int file = 0; |
71e3aac07 thp: transparent ... |
852 853 854 855 |
VM_BUG_ON(!PageHead(page)); VM_BUG_ON(PageCompound(page_tail)); VM_BUG_ON(PageLRU(page_tail)); |
fa9add641 mm/memcg: apply a... |
856 857 |
VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&lruvec_zone(lruvec)->lru_lock)); |
71e3aac07 thp: transparent ... |
858 |
|
5bc7b8aca mm: thp: add spli... |
859 860 |
if (!list) SetPageLRU(page_tail); |
71e3aac07 thp: transparent ... |
861 |
|
12d271078 memcg: fix split_... |
862 863 |
if (likely(PageLRU(page))) list_add_tail(&page_tail->lru, &page->lru); |
5bc7b8aca mm: thp: add spli... |
864 865 866 867 868 |
else if (list) { /* page reclaim is reclaiming a huge page */ get_page(page_tail); list_add_tail(&page_tail->lru, list); } else { |
12d271078 memcg: fix split_... |
869 870 871 872 873 874 875 876 |
struct list_head *list_head; /* * Head page has not yet been counted, as an hpage, * so we must account for each subpage individually. * * Use the standard add function to put page_tail on the list, * but then correct its position so they all end up in order. */ |
e180cf806 thp, mm: avoid Pa... |
877 |
add_page_to_lru_list(page_tail, lruvec, page_lru(page_tail)); |
12d271078 memcg: fix split_... |
878 879 |
list_head = page_tail->lru.prev; list_move_tail(&page_tail->lru, list_head); |
71e3aac07 thp: transparent ... |
880 |
} |
7512102cf memcg: fix GPF wh... |
881 882 |
if (!PageUnevictable(page)) |
e180cf806 thp, mm: avoid Pa... |
883 |
update_page_reclaim_stat(lruvec, file, PageActive(page_tail)); |
71e3aac07 thp: transparent ... |
884 |
} |
12d271078 memcg: fix split_... |
885 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
71e3aac07 thp: transparent ... |
886 |
|
fa9add641 mm/memcg: apply a... |
887 888 |
static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec, void *arg) |
3dd7ae8ec mm: simplify code... |
889 |
{ |
13f7f7898 mm: pagevec: defe... |
890 891 892 |
int file = page_is_file_cache(page); int active = PageActive(page); enum lru_list lru = page_lru(page); |
3dd7ae8ec mm: simplify code... |
893 |
|
3dd7ae8ec mm: simplify code... |
894 895 896 |
VM_BUG_ON(PageLRU(page)); SetPageLRU(page); |
fa9add641 mm/memcg: apply a... |
897 898 |
add_page_to_lru_list(page, lruvec, lru); update_page_reclaim_stat(lruvec, file, active); |
c6286c983 mm: add tracepoin... |
899 |
trace_mm_lru_insertion(page, page_to_pfn(page), lru, trace_pagemap_flags(page)); |
3dd7ae8ec mm: simplify code... |
900 |
} |
1da177e4c Linux-2.6.12-rc2 |
901 |
/* |
1da177e4c Linux-2.6.12-rc2 |
902 903 904 |
* Add the passed pages to the LRU, then drop the caller's refcount * on them. Reinitialises the caller's pagevec. */ |
a0b8cab3b mm: remove lru pa... |
905 |
void __pagevec_lru_add(struct pagevec *pvec) |
1da177e4c Linux-2.6.12-rc2 |
906 |
{ |
a0b8cab3b mm: remove lru pa... |
907 |
pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL); |
1da177e4c Linux-2.6.12-rc2 |
908 |
} |
5095ae837 mm: fewer undersc... |
909 |
EXPORT_SYMBOL(__pagevec_lru_add); |
1da177e4c Linux-2.6.12-rc2 |
910 |
|
1da177e4c Linux-2.6.12-rc2 |
911 |
/** |
e714f0cf0 mm + fs: prepare ... |
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 |
* pagevec_lookup_entries - gang pagecache lookup * @pvec: Where the resulting entries are placed * @mapping: The address_space to search * @start: The starting entry index * @nr_entries: The maximum number of entries * @indices: The cache indices corresponding to the entries in @pvec * * pagevec_lookup_entries() will search for and return a group of up * to @nr_entries pages and shadow entries in the mapping. All * entries are placed in @pvec. pagevec_lookup_entries() takes a * reference against actual pages in @pvec. * * The search returns a group of mapping-contiguous entries with * ascending indexes. There may be holes in the indices due to * not-present entries. * * pagevec_lookup_entries() returns the number of entries which were * found. */ unsigned pagevec_lookup_entries(struct pagevec *pvec, struct address_space *mapping, pgoff_t start, unsigned nr_pages, pgoff_t *indices) { pvec->nr = find_get_entries(mapping, start, nr_pages, pvec->pages, indices); return pagevec_count(pvec); } /** * pagevec_remove_exceptionals - pagevec exceptionals pruning * @pvec: The pagevec to prune * * pagevec_lookup_entries() fills both pages and exceptional radix * tree entries into the pagevec. This function prunes all * exceptionals from @pvec without leaving holes, so that it can be * passed on to page-only pagevec operations. */ void pagevec_remove_exceptionals(struct pagevec *pvec) { int i, j; for (i = 0, j = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; if (!radix_tree_exceptional_entry(page)) pvec->pages[j++] = page; } pvec->nr = j; } /** |
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* pagevec_lookup - gang pagecache lookup * @pvec: Where the resulting pages are placed * @mapping: The address_space to search * @start: The starting page index * @nr_pages: The maximum number of pages * * pagevec_lookup() will search for and return a group of up to @nr_pages pages * in the mapping. The pages are placed in @pvec. pagevec_lookup() takes a * reference against the pages in @pvec. * * The search returns a group of mapping-contiguous pages with ascending * indexes. There may be holes in the indices due to not-present pages. * * pagevec_lookup() returns the number of pages which were found. */ unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, pgoff_t start, unsigned nr_pages) { pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages); return pagevec_count(pvec); } |
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EXPORT_SYMBOL(pagevec_lookup); |
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unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, int tag, unsigned nr_pages) { pvec->nr = find_get_pages_tag(mapping, index, tag, nr_pages, pvec->pages); return pagevec_count(pvec); } |
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EXPORT_SYMBOL(pagevec_lookup_tag); |
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/* * Perform any setup for the swap system */ void __init swap_setup(void) { |
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unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT); |
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#ifdef CONFIG_SWAP |
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int i; bdi_init(swapper_spaces[0].backing_dev_info); for (i = 0; i < MAX_SWAPFILES; i++) { spin_lock_init(&swapper_spaces[i].tree_lock); INIT_LIST_HEAD(&swapper_spaces[i].i_mmap_nonlinear); } |
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#endif |
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/* Use a smaller cluster for small-memory machines */ if (megs < 16) page_cluster = 2; else page_cluster = 3; /* * Right now other parts of the system means that we * _really_ don't want to cluster much more */ |
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} |